Following the death of actor Leonard Nimoy , who portrayed Mr. Spock on Star Trek , countless tributes have poured in for the man who popularized the phrase “Live, long and prosper.” Among those remembering Nimoy’s legacy are astronauts, scientists, writers, sci-fi fans, fellow actors and directors and even President Barack Obama, who wrote in a statement from the White House , “I loved Spock.” Following the death of actor Leonard Nimoy , who portrayed Mr. Spock on Star Trek , countless tributes have poured in for the man who popularized the phrase “Live, long and prosper.”